Parallel clamp for holding jig and fixture buttons



I H. v. GOULD. PARALIEL CLAMP FOR HOLDING JIG AND FIXTURE BUTTONS.

APPLICATION FILED FEB- 3,1919.

Patented/ct. 18, 1921.

INVENTOR AT'TORNEY UNITED STATES HARRY V. GOULD, OF BRIDGEPORT, CONNECTICUT.

PARALLEL CLAN? FOR HOLDING JIG AND FIXTURE BUTTONS.

Application filed February 3, 1919.

T 0 all who-m1 it may concern:

Be it known that I, HARRY V. GOULD, a citizen or" the United States, residing at Bridgeport, county of Fairfield, State of Connecticut, have invented an Improvement in Parallel Clamps for Holding Jig and Fixture Buttons, of which the following is a specification. A

This invention has for its object to provide a clamp especially adapted for use by tool makers in adjusting the tubular buttons, so called, commonly known as jig and fixture buttons and used where it is required to locate holes with extreme accuracy in jigs and fixtures; a valuable feature of the in vention being that it provides parallel edges between which a button may be moved in one direction only thus enabling a second adjustment to be made without causing the slightest error in the previous adjustment.

With these and other objects in view I have devised the novel button holding clamp which I will now describe referring to the accompanying drawing forming a part of this specification and using reference charactors to indicate the several parts.

Figure 1 is an elevation of my novel holding clamp as in use;

Fig. 2 a perspective view of the clamp and accessory parts; and

Fig. 3 is an elevation partly in vertical section, illustrating different positions of the clamp in laying out holes in a jig, fixture or other piece of work.

10 denotes a jig, fixture or other piece of work, which for convenience I will hereafter refer to as a jig, 11 screws, 12 a jig or fixture button, which for convenience I will term a button, 13 washers and 14; and 15 nuts. Cooperating with these parts is a camp or yoke consisting of cross piece 16 having acentral unthreaded hole/17 and arms 18 having at their ends bars 19 lying at right angles to the arms. The bars are provided with inner faces 20 which lie parallel to each other and are preferably provided, for convenience in use, with recesses 21 which receive the button, as will be more fully explained. The faces may be adjusted to the button by means of screws 22 extending between the bars.

Turning now to Fig. 3, suppose that it 1s required to locate four holes at substantially the positions occupied by the four screws in the figure. Four buttons would be used, which are indicated respectively by 12, 12",

Specification of Letters Patent.

Patented Oct. 18, 1921.

Serial No. 274,783.

12 and 12, the latter appearing in dotted lines only, in the upper left hand corner. will be understood ot'course that every ig is supposed to have two working edges, constituting a-right angle triangle, from which to scale distances and from which a screw 11 may be located. These working edges, in the present instance, are indicated by 28 and 24. The starting point, in the present instance, is the upper right hand corner of the'jig. using edge 23 as a horizontal working edge with edge 241 as its perpendicular. The center of a hole for the first screw is located as accurately as possible, in the usual manner, and a drilling point indicated. From this point the other drilling points are scaled off and scribed, and then the four holes aredrilled and tlneaded. Next a screw 11 is turned into each hole, a button placed on each screw, and each button secured in place by a nut 15 and washer, the nuts over buttons 12", 12 and 12 being turned down tightly enough to hold the buttons frictionally, leaving them however free to be moved by tapping and button 12 be ing locked in place. It will be understood of course that the longitudinal holes in the buttons are of appreciably greater diameter than the screws, so that the buttons may have the necessary lateral movement. The exact perpendicular distance between buttons 12 and 12 is now obtained by the use of a suitable measuring instrument, for example a height gage, button 12 being moved upward or downward as may be required by tapping. This is the first perpendicular adjustment of button 12". The position of the jig is now changed. making edge 24 the horizontal and edge 23 the perpendicular. Up to this time no use has been made of the present invention, which is, however, of great value in accurately locating buttons 12 12 and 12. A clamp is now placed over button 12, use being made of the recesses in passing the bars over the button. The clamp is then moved sufficiently to place the button between the parallel faces of the bars, and permit the screw 11 to pass through hole 17 in the clamp. The bars of the clamp are placed parallel with edge 23 and the clamp is locked in place by a nut 14 and washer.

It is now that the advantages of the present invention are to be appreciated in adjusting button 12 up or down. If it was not for the parallel edges of the bars not-hing 12 and again in locating button 12.

Having thus described my invention, I claim: 7

1. A clamp of the character described comprising a cross piece having a central unthreaded hole, arms extending from the cross piece, and bars having parallel inner faces at the ends of the arms, said bars being provided with recesses for convenience in.

passing the bars over a fixture button.

2. A clamp for adjusting tool makers jig and fixture buttons, comprising a cross piece having a central unthreaded hole to receive a screw, fixed arms extending from the cross piece, bars with parallel button engaging faces extending from said arms, and screws extending between the bars by which the parallel button engaging faces may be ad justed toward or from each other.

3. The combination with a screw and a tubular button of greater internal diameter than the screw, of a clamp comprising a cross piece having a central unthreaded hole to receive the screw, arms extending from the cross piece, and bars at the ends of the arms having parallel inner faces adapted to engage the button.

a. The combination with a screw and a tubular button of greater internal diameter than the screw, of a clamp comprising a cross piece having a central unthreaded hole to receive the screw, arms extending from the cross piece, bars at the ends of the arms having parallel inner faces adapted to engage the button, a nut on the screw lying under the cross piece by which the button may be frictionally held or locked, and a nut on the screw above the cross piece by which the clamp is held in place.

5. The combination with a screw and a tubular button of greater internal diameter than the screw, of. aclamp comprising a cross piece having a central unthreaded hole to receive the screw, arms extending from the cross piece, bars at the ends of the arms having parallel inner faces adapted to engage the button and recesses to receive the button in attachment, and nuts and washers on the screw above and below the cross piece by which the button and the clamp may be independently held in place.

6. The combination with a screw and a tubular button of greater internal diameter than the screw, of a clamp comprising a cross piece having a central unthreaded hole to receive the screw, arms extending from the cross piece, bars at the ends of the arms having parallel inner face adapted to engage the button, screws extending between the bars by which the parallel faces may be adjusted relatively to the button, and nuts and washers on the screw above and below the cross piece by which the button and the clamp may beindependently held in place.

In testimony whereof I affix my signature.-

HARRY V. GOULD. 

